Agitator



Dec. 1929. J. BOND. 1,737,702

- AGITATOR Fild March 5, 1922:

' Patented Dec. 3, 1929 PATENT, OFFICE JQSEPE E. BOND, OF APPLETON, WISCONSIN AGITATOR Application filed March 5, 128. Serial No. 259,084.

5 found possible to greatly increase the capacity delivery to the Fourdriniers.

of a given equipment by increasing the density (or, in other words, lessening the fluidity) of the pulp during its treatment preceding While in the old practice a 2 pulp was considered proper and of the max1mum density possible, it is now common to deal with 6% solutions, with correspondingly increased production capacity. 7

However, many difficult problems are encountered in handling pulp of this density due to its lack of fluidity and its tendency to mass or cake in the storage or treatment tanks and containers. This tendency is inherent in the nature of the material under treatment due to its fibrous character and to the physical law of attraction of solids. The liquids within which the solids-are carried serves merely as a supporting medium therefor and facilitates rather than hinders the massing and intertwining of the fibers.

To avoid massing and stratifying of the pulp in the liquid and to maintain a uniform density throughout the entire body of material it must be kept in motion and the motion producing means should have a tendency to break up and tear apart any large or small masses of pulp. In the old practice the mixture was kept in motion by means of paddles or impellers in the tank, but this apparatus had very little tendency to break up masses of pulp, and was wholly ineffective with stock of increased density. Furthermore, such apparatus required an outlet of power not commensurate with the results secured.

The tanks, chests or containers which are in place and must be utilized for the new plan of operation are of many and varied forms, all of great size, some narrow and of great length, some deep and some round. The problem has been, therefore, to provide means applicable to these various forms of tanks that would insure efiective-circulation, the breaking up of pulp masses and the maintenance at all times of a proper consistency throughout the whole volume of material, with a minimum of power expenditure.

My invention will be more readily under stood by reference to the accompanying drawing, in which I Fig. 1 is a plan view of apparatus constricted in accordance with my invention,

Fig. 2 is an end elevation thereof taken on the line 22 of Fig. 1. I

By referring to the drawings, and more particularly to Fig. 1, it will be seen that T have provided a relatively square liquid chamber or tank 10, having two parallel baflle walls 11, 12 therein spaced from the end walls. At the end of each of said baflle walls and s aced from the side wall, I provide the deectors 13, 14 for a purpose later to. be described.

At one side of the tank, ll provide the pumps 15, 16, operated by the motor 15 16. The pumps are connected on their lower sides to the inlet parts 17, 18, 19, 20 in the lower part of the side wall in the end compartments. The pumps are connected on their opposite side to the discharge pipes 21, 22, 23, 24 10- cated near the top of the side wall in the center compartment. Thus it is seen that the discharge from both pumps enters the middle compartment and flows around the baffles 13, 14 to the inlets in the bottom of the end coinpartments.

It is readily apparent that by means of a device constructed as herein described, stock of the highest percentage may be agitated efficiently and Stratification avoided. Drawing the stock in at the bottom and discharging it at the top of the tank, together with the circulating efiect of the deflectors, causes a constant moving of the mass in the roundabout direction back to the pump.

Obviously modifications and variations may be made in the apparatus herein disclosed, all without departure from the spirit of my invention, and I do not wish to be limited except as indicated in the appended claims.

I claim:

1. In combination, a tank of substantially equal length and breadth, two baffle walls I therein connected to one end wall of the tank and spaced from the other end wall, thereby forming three adjacentcompartments, a deflector disposed across the end of each of said ballle walls. and two pumps each having an inlet connection to a side compartment and each having a discharge connection to the middle compartment.

2. In combination, a tank of substantially equal length and breath, two battle walls therein connected to one end wall of the tank and spaced from the other end wall, thereby forming three adjacent compartments, a deflector disposed across the end of each of said battle walls, and two pumps each having an inlet connection to a side compartment and each having a plurality of discharge connections to the middle compartment.

3. In combination, a tank of substantially equal length and breadth, two battle walls therein connected to one end wall and spaced from the opposite end wall, thereby forming three adjacent compartments, a deflector disposed across the end of each of said baffle walls, and two pumps, each having a plurality of inlet connections to one side thereof and each having a single discharge opening to the middle compartment of said tank, said inlet connections being at a point lower in said side wall than said discharge opening.

4. In combination, a tank of substantially equal length and breadth, two baffle walls therein connected to one end wall of the tank and spaced from the other end wall, thereby forming three adjacent compartments, a de-' fiector disposed across the end of each of said bafiie walls, and two pumps each having an inlet connection to a side compartment and each having a plurality of discharge connections to the middle compartment, said discharge openings being at a point higher in said side wall than said inlet openings.

5. In apparatus of the class described, the combination of a liquid chamber, a plurality of pumps outside of said chamber having a plurality of inlets, in the bottom of one side of said chamber and a plurality of discharge outlets above said inlets in the same wall of said chamber, a dividing wall between said inlet and said discharge openings, and a deflector at the end of each of said dividing walls opposite from said inlet and discharge openings. a

6. In apparatus of the class described, the combination of a liquid chamber, a plurality of parallel, laterally disposed dividing walls, one end of said walls being joined to a side wall of said chamber, a deflector at the other end of said lateral walls, a plurality of inlet parts in the bottom of one side wall at the extremities thereof, discharge parts located in said side wall between said dividing walls, and a pump for each set of inlet and discharge pipes.

7. In combination, a tank, two baffle walls middle compartment is broken up into two oppositely directed streams that flow back into the side compartments.

In testimony whereof I have afiixed my signature.

JOSEPH E. BOND. 

